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When the program starts, add-Dsun.net.maxDatagramSockets=xxx.1. Creator: FactoryPizzaStore as defined above. It is an abstract class, which defines the method of creating objects. This method is an abstract method, and the specific process of creating objects is implemented by its subclasses. This abstract class usually relies on an abstract Product (another role in the factory method pattern) class. These abstract products are made by subclasses, and the creators do not care what kind of products are made.Return new MyIterator (this);There is a key point here. Once you get on the CDN, don't disclose the IP address of the source server, otherwise the attacker can bypass the CDN and directly attack the source server. All previous efforts are in vain. Search for "bypassing CDN to obtain real IP addresses" and you will know how rampant the domestic black industry is.Next, I began to learn JDK & JAVA from October to improve my knowledge. Design Pattern is a summary of the experience of predecessors in code development and a series of routines to solve specific problems. It is not a syntax regulation, but a set of solutions to improve code reusability, maintainability, readability, robustness and security.